Conceptual Design and Weight Optimization of Aircraft Power Systems with High-Peak Pulsed Power Loads

Li, Qian; Devarajan, Balakrishnan; Zhang, Xuning; Burgos, Rolando; Boroyevich, Dushan; Raj, P. Markondeya

doi:10.4271/2016-01-1986

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…With More Electric Aircrafts (MEA) soon to be taking over the aerospace industry, the requirement of light weight structural components [1] which can withstand high temperature gradients [2] is immense. Composite structures are increasingly being used for such applications due to their high strength and stiffness to weight ratios.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration analysis of Curvilinearly Stiffened Composite plates with an arbitrarily shaped cutout using Isogeometric Analysis

Devarajan¹

2021

Preprint

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This paper focuses on the isogeometric vibration analysis of curvilinearly stiffened composite panels. The stiffness matrices and the mass matrices are derived using the first-order shear deformation theory (FSDT). The present method models the plate and the stiffener separately, which allows the stiffener element nodes to not coincide with the plate shell-element nodes. The stiffness and mass matrices of a stiffener are transformed to those of the plate through the displacement compatibility conditions at the plate-stiffener interface by interpolation using NURBS basis functions. Cutouts are modeled using a single NURBS patch generated by creating a ruled surface between two curves. The proposed formulation is first validated by comparing it with available literature. The effects of width-to-thickness ratio, fiber orientation, ply layups, shape and size of the cutouts and the boundary conditions on the response of stiffened composite plates are then analyzed and the numerical results are used to derive useful conclusions.

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Section: Introductionmentioning

confidence: 99%

Free Vibration analysis of Curvilinearly Stiffened Composite plates with an arbitrarily shaped cutout using Isogeometric Analysis

Devarajan¹

2021

Preprint

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“…The first meaningful observation on the beam vibration appears to be the one conducted by Bernoulli. From his observation, [1] he discovered that the curvature of an elastic beam is proportional to the bending moment. Later, Leonhard Euler accepted Bernoulli's assumption and made many advances on the elastic curves.…”

Section: Introductionmentioning

confidence: 99%

“…However, as well-known fact, it overestimates the natural frequencies of the beams especially for higher modes and is eligible for slender beams. Rayleigh [1] introduced rotatory inertia effect and corrected the overestimation of natural frequency for some problems. But in particular problems, the introduction of shear was still required in order to improve the accuracy of natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis of Timoshenko Beams using Isogeometric Analysis

Devarajan

2021

Preprint

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In this paper, the finite free-form beam element is formulated by the isogeometric approach based on the Timoshenko beam theory to investigate the free vibration behavior of the beams. The non-uniform rational B-splines (NURBS) functions which define the geometry of the beam are used as the basis functions for the finite element analysis. In order to enrich the basis functions and to increase the accuracy of the solution fields, the h-, p-, and k-refinement techniques are implemented. The geometry and curvature of the beams are modelled in a unique way based on NURBS. All the effects of the the shear deformation, and the rotary inertia are taken into consideration by the present isogeometric model. Results of the beams for non-dimensional frequencies are compared with other available results in order to show the accuracy and efficiency of the present isogeometric approach. From numerical results, the present element can produce very accurate values of natural frequencies and the mode shapes due to exact definition of the geometry. With higher order basis functions, there is no shear locking phenomenon in very thin beam situations. Finally, the benchmark tests described in this study are provided as future reference solutions for Timoshenko beam vibration problem.

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“…Thermal effects, especially thermal buckling is important to be considered in design, analysis and weight optimization of aircraft structures [27]and [28]. Such problems have been researched by many in the past.…”

Section: Introductionmentioning

confidence: 99%

Thermal buckling of curvilinearly stiffened laminated composite plates with cutouts using isogeometric analysis

Devarajan

Kapania

2020

Composite Structures

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Conceptual Design and Weight Optimization of Aircraft Power Systems with High-Peak Pulsed Power Loads

Cited by 11 publications

References 7 publications

Free Vibration analysis of Curvilinearly Stiffened Composite plates with an arbitrarily shaped cutout using Isogeometric Analysis

Free Vibration analysis of Curvilinearly Stiffened Composite plates with an arbitrarily shaped cutout using Isogeometric Analysis

Vibration Analysis of Timoshenko Beams using Isogeometric Analysis

Thermal buckling of curvilinearly stiffened laminated composite plates with cutouts using isogeometric analysis

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